“True” negative thermal expansion in Mn-doped LaCu{sub 3}Fe{sub 4}O{sub 12} perovskite oxides
- Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, 1-2 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8570 (Japan)
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 (Japan)
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 (Japan)
Negative and zero thermal expansion near room temperature have been achieved in a cubic A-site ordered perovskite oxide LaCu{sub 3}Fe{sub 4−x}Mn{sub x}O{sub 12}. A discontinuous volume change in the parent material LaCu{sub 3}Fe{sub 4}O{sub 12}, owing to a first-order intermetallic charge transfer transition (3Cu{sup 2+ }+ 4Fe{sup 3.75+} ⇄ 3Cu{sup 3+ }+ 4Fe{sup 3+}), is efficiently relaxed to a second-order-type negative thermal expansion with a linear thermal expansion coefficient (α{sub L}) of −2.2(1) × 10{sup −5 }K{sup −1} between 300 and 340 K at x = 0.75, followed by an almost zero thermal expansion [α{sub L} of −1.1(2) × 10{sup −6 }K{sup −1}] at x = 1 in a wide temperature range (240–360 K) including room temperature. Magnetic susceptibility measurements display substantial broadenings of the antiferromagnetic transition when x increases, supporting the relaxation of first-order electronic phase transition of the parent material. These findings indicate that the significant adjustability of thermal expansion properties can be achieved in first-order intermetallic charge-transfer transition.
- OSTI ID:
- 22395463
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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